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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Reference
Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Justification for type of information:
Data is from peer reviewed journal.
Qualifier:
according to
Guideline:
other: as mentioned below
Principles of method if other than guideline:
To study the effects of molybdenum trioxide, toxicity to algae test was carried out for 72 hrs.
GLP compliance:
not specified
Specific details on test material used for the study:
- Name of test material (as cited in study report): Ammonium molybdate(VI)
- Molecular formula (if other than submission substance): MoO42H4N
- Molecular weight (if other than submission substance): 196.0132 grams/mole
- Smiles notation (if other than submission substance): 1S/Mo.2H3N.4O/h;2*1H3;;;;/q;;;;;2*-1/p+2
- InChl (if other than submission substance): APUPEJJSWDHEBO-UHFFFAOYSA-P
- Structural formula attached as image file (if other than submission substance): see Fig. No data available
- Substance type: Inorganic
- Physical state: Solid
Analytical monitoring:
not required
Vehicle:
not specified
Test organisms (species):
Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
Details on test organisms:
TEST ORGANISM
- Strain: CIMM
Test type:
not specified
Water media type:
freshwater
Limit test:
no
Total exposure duration:
72 h
pH:
8.0–8.1
Details on test conditions:
mg Ca/L: 4.9
mg Mg/L: 2.9
Duration:
72 h
Dose descriptor:
NOEC
Effect conc.:
25 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth rate
Conclusions:
No observed effect concentrations (NOEC) for Scenedesmus subspicatus is 25mg/L when exposed to Ammonium molybdate(VI) for 72 hrs. Based on the value it can be concluded that the Ammonium molybdate(VI) is not toxic to algae and cayanobacteria
Executive summary:

Toxicity to algae test was performed for Ammonium molybdate(VI) onScenedesmus subspicatus for 72 hrs, theNo observed effect concentrations (NOEC) obtained is 25mg/L.On the basis of No observed effect concentrations (NOEC) obtained 25mg/L it can be concluded that the Ammonium molybdate(VI) is not toxic to algae Scenedesmus subspicatus. Based on the value it can be concluded that the Ammonium molybdate(VI) is not toxic to algae and cayanobacteria and can be considered to be “not classified” under CLP regulation.

Description of key information

Toxicity to algae test was performed for Ammonium molybdate(VI) onScenedesmus subspicatus for 72 hrs, the No observed effect concentrations (NOEC) obtained is 25mg/L.On the basis of No observed effect concentrations (NOEC) obtained 25mg/L it can be concluded that the Ammonium molybdate(VI) is not toxic to algae Scenedesmus subspicatus.

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
25 mg/L

Additional information

Two studies from experimental data from peer reviewed Journal for toxicity to aquatic algae endpoint of test chemical Ammonium molybdate(VI) (CAS No. 13106-76-8) with relevant read across which is structurally similar were summarised as follows:

Experimentyal study available for target from peer reviewed Journal Science of the Total Environment 2010, suggests that the Toxicity to algae test was performed for Ammonium molybdate(VI) onScenedesmus subspicatus for 72 hrs, the No observed effect concentrations (NOEC) obtained is 25mg/L.On the basis of No observed effect concentrations (NOEC) obtained 25mg/L it can be concluded that the Ammonium molybdate(VI) is not toxic to algae Scenedesmus subspicatus. Based on the value it can be concluded that the Ammonium molybdate(VI) is not toxic to algae and cayanobacteria.

The above study is supported by experimental data of read across Molybdenum trioxide (CAS No. 1313-27-5) from peer reviewed JournalScience of the Total Environment 2010, indicates that toxicity to algae test was performed for molybdenum trioxide on Scenedesmus subspicatus for 72 hrs, the No observed effect concentrations (NOEC) obtained is > 100 mg/L.

On the basis of No observed effect concentrations (NOEC) obtained > 100 mg/L it can be concluded that the molybdenum trioxide is not toxic to algae Scenedesmus subspicatus.

Thus based on the effect concentrations which is in the range 25 mg/l to >100 mg/L give the conclusion that test substance Ammonium molybdate(VI) (CAS No. 13106-76-8)s likely to be non toxic was likely to be non toxic to aquatic algae at environmentally relevant concentrations and can be considered to be not classified as per the CLP classification criteria.